GenEXXA 32-8207 User manual
STEREO SOUND MIXER
Cat. No. 32-8207
Specification
.
.
.
.
.
.
.
.
Block
Diagam
.
.
.
.
.
.
.
Circuit Description
.
.
.
.
.
Troubleshooting
.
.
.
.
.
PCB Views
.
.
.
.
.
.
.
Electrical Parts List
.
.
.
Exploded View
.
.
.
.
I
IC Lead Identification
.
.
Voltage Chart.
.
.
.
.
.
Schematic Diagram
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
..........
..........
..........
..........
..........
..........
..........
...........................
5
...........................
6
...........................
7
..........................
-12
...........................
14
...........................
15
...........................
©1
994
InterTAN
Inc.
All Rights Resewed.
Trademark of
InterTAN
Inc.
SPECIFICATIONS
Input Sensitivity/Impedance:
MIC
...................................................
3mV
/
600 ohms
PHONO
1,2
..............................................
3mV
/
50k ohms
CD
1,2
................................................. 150mV
/
50k ohms
VIDEO
.................................................. 150mV
/
50k ohms
LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Level:
MASTER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
......
......
.
.
.
.
.
.
.
.
.
.
150mV
/
50k ohms
.
.
.
.
.
.
.
.
.
.
.
.
.
.
RATED:
1.5V
MAX
:
6V
RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RATED: 0.775V
MAX
:
5V
PHONES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RATED: 28.28mV
S/N Ratio:
MIC
...............................................................
60
dB
PHONO
.............................................................
70
dB
CD,LINE,VIDEO.....................................................
75
dB
Distortion:
MIC
...............................................................
0.5%
PHONO
.............................................................
0.2%
CD,LINE,VIDEO
.....................................................
0.02%
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
370mm(L)x212mmWx65mm(H)
-2-
CIRCUIT DESCRIPTION
THEORY OF OPERATION
AS SHOWN IN THE BLOCK DIAGRAM, THIS MIXER HAS 5 INPUTS AND 3 OUTPUTS.
THE DC
15V
POWER SUPPLY ENABLES THE
18V/AC
ADAPTOR TO BE CONVERTED TO
±15V
/DC AND IS USED TO FEED THE
IC
OF EACH STAGE AND LAMP OF THE VU METER.
THE MIC SIGNAL FROM INPUT JACK THROUGH
MIC
AMPLIFIER
(IC2
IS A LINEAR AMP-
LIFIER) MAGNIFICATION, THEN SEND TO THE MIC LEVEL
CONTROL(VRl),
AFTERWARD,
THE MIC SIGNAL IS SEND TO THE MIXING BUS. AND THE
PHONO
l(IC3.VR2)/PHONO
2
(IC4/VR3)
LIKEWISE.
(IC3/IC4
IS A MATCH TO RIAA CURVES UNLINEAR AMPLIFIER)
THE SIGNAL OF
CDl/VIDEO
FROM INPUT JACK IS DIRECTLY SEND TO THE LEVEL
CON-
TROL(VR4),
THEN SEND TO THE MIXING BUS. AND
CD2/LINE
LIKEWISE.
THE SIGNAL OF MIXING BUS GOES TO THE WEIGHTED SUMMING AMPLIFIER(IC6) AND
THEN ON TO THE MASTER GAIN STAGE(IC1) MAGNIFYING IT WHICH RESULTS AS OUT-
PUT GOING TO THE REC OUTPUT JACKS AND THE MASTER OUTPUT STAGE
(IC5),
AND
THE MASTER OUTPUT STAGE(IC5 IS A LINEAR AMPLIFIER) SEND THE OUTPUT SIGNAL
TO THE OUTPUT JACKS.
THE SIGNAL COMING FROM THE MASTER OUTPUT STAGE(IC5) GOES THROUGH THE VU
METER
AMPLIFIER(IC7),
WHICH IS THEN SHOWN ON THE VU METER.
THE SIGNAL(PRE-FADE)
OF EA
C
H
CHA
N
NELS
GO
ES
THROUGH
THE
MONITOR
SELEC
T
swI-
TCH (ROTARY SWITCH
SW1)WHICH
IS THEN TRANSMITTED TO THE HEADPHONE
AMPLIFI-
ER(IC8)
&
MAGNIFIED,THEN GOES TO THE HEADPHONE JACK.
TROUBLESHOOTING
THIS TROUBLESHOOTING GUIDE SUGGEST AREAS TO CHECK TO FIND PROBLEMS. IN
GENERAL, EACH FAULT IS FOLLOWED BY A LIST OF POINTS TO CHECK. THESE
POINTS RANGE FROM THE MOST POSSIBBLE TO THE LEAST LIKELY.
FAULT
POINTS TO CHECK
DEAD UNIT
*
CHECH THE AC ADAPTOR.
(VU METER NO
LIGHT)
* CHECK THE POWER SWITCH.
*
CHECK THE POWER INPUT JACK.
VU METER WITH
*CHECK THE VOLTAGE REGULATORS.
(IC9,IClO)
LIGHT BUT MASTER
*CHECK
IC6,ICl,IC5,IC7
OUTPUT NO SIGNAL
VU METER WORKS BUT
*CHECK THE WIRE CONNECTED BETWEEN
R46, R47
AND
MASTER OUTPUT NO
MASTER OUTPUT JACKS.
SIGNAL OUTPUT
MIC CHANNEL NOT
*
CHECK
IC2
AND SURROUNDING PARTS
WORKING
PHONO 1 NOT WORKING
*
CHECK IC3 AND SURROUNDING PARTS
PHONO 2 NOT WORKING *CHECK IC4 AND SURROUNDING PARTS
HEADPHONE OUTPUT
*
CHECK
IC8
AND SURROUNDING PARTS
NOT WORKING
-5-
Ref.No.
Description
RESISTORS RS Part No. MFR'S PART NO.
R42
RESISTORS CARBON
1/4W±5%
1K
OHM
12RCT1/4JlK
R43
RESISTORS CARBON
1/4W±5%
1K
OHM
12RCT1/4JlK
R44
RESISTORS CARBON
1/4W±5%
1OOK
OHM
12RCT1/4JlK
R45
RESISTORS CARBON
1/4W±5%
100K
OHM
12RCT1/4JlK
R46
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R47
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R48
RESISTORS CARBON
1/4W±5%
150K OHM
12RCT1/4J150K
R49
RESISTORS CARBON
1/4W±5%
150K OHM
12RCT1/4J150K
R50
RESISTORS CARBON
1/4W±5%
1OOK
OHM
12RCT1/4JlOOK
R51
RESISTORS CARBON
1/4W±5%
1OOK
OHM
12RCT1/4JlOOK
R52
RESISTORS CARBON
1/4W±5%
1OOK
OHM
12RCT1/4JlOOK
R53
RESISTORS CARBON
1/4W±5%
100K
OHM
12RCT1/4JlOOK
R54
RESISTORS CARBON
1/4W±5%
1OOK
OHM
12RCT1/4JlOOK
R55
RESISTORS CARBON
1/4W±5%
3.3K
OHM
12RCTY4J3.3K
R56
RESISTORS CARBON
1/4W±5%
3.3K
OHM
12RCT1/4J3.3K
R57
RESISTORS CARBON
1/4W±5%
3.3K
OHM
12RCT1/4J3.3K
R58
RESISTORS CARBON
1/4W±5%
3.3K
OHM
12RCT1/4J3.3K
R59
RESISTORS CARBON
1/4W±5%
6.8K
OHM
12RCT1/4J6.8K
R60
RESISTORS CARBON
1/4W±5%
6.8K
OHM
12RCT1/4J6.8K
R61
RESISTORS CARBON
1/4W±5%
56K OHM
12RCT1/4J56K
R62
RESISTORS CARBON
1/4W±5%
390K OHM 12RCT1/4J390K
R63
RESISTORS CARBON
1/4W±5%
390K OHM
12RCT1/4J390K
R64
RESISTORS CARBON
1/4W±5%
56K OHM 12RCT1/4J56K
R65
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R66
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R67
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R68
RESISTORS CARBON
1/4W±5%
390K OHM
12RCT1/4J390K
R69
RESISTORS CARBON
1/4W±5%
390K OHM 12RCT1/4J390K
R70
RESISTORS CARBON
1/4W±5%
100 OHM 12RCT1/4JlOO
R71
RESISTORS CARBON
1/4W±5%
150K OHM
12RCT1/4J150K
ICS
ICl
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC2
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC3
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC4
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC5
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC6
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC7
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC8
OPRATIONAL AMPLIFIER IC
NJM4558DD
03ICNJM4558DD
IC9
VOLTAGE REGULATOR IC
NJM7815
03ICNJM7815
IClO
VOLTAGE REGULATOR IC
NJM7915
03ICNJM7915
-8-
Ref.No.
Description
DIODES RS Part No. MFR'S PART NO.
:I
DIODE
lN4148
lODITlN4148
DIODE
lN4148
lODITlN4148
D3
DIODE
lN4148
lODITlN4148
D4
DIODE
lN4148
lODITlN4148
::
DIODE
lN4001
lODITlN4001
DIODE
lN4001
lODITlN4001
D7
DIODE
lN4001
lODITlN4001
SLIDE POTENTIOMETERS
&
SWITCHS
VRl
VR2
VR3
VR4
VR5
SW1
SLIDE POTENTIOMETER 60mm
1OOK
B*2
16SV60F1572BlOOK
SLIDE POTENTIOMETER 60mm
1OOK
B*2
16SV60F1572BlOOK
SLIDE POTENTIOMETER 60mm
1OOK
B*2
16SV60F1572BlOOK
SLIDE POTENTIOMETER 60mm
1OOK
B*2
16SV60F1572BlOOK
SLIDE POTENTIOMETER 60mm
1OOK
B*2
16SV60F1572BlOOK
ROTARY SWITCH
5 BAND
2 CIRCUIT 63SWR05L2S12PlB
CAPACITORS
Cl
c2
c3
E;
C6
c7
C8
c9
Cl0
Cl1
Cl2
Cl3
Cl4
Cl5
Cl6
Cl7
Cl8
Cl9
c20
c21
c22
C23
C24
C25
C26
C27
CERAMIC
±10%
20PF/lOOV
CERAMIC
±10%
20PF/lOOV
ELECTROLYTIC
±10%
470UF/16V
ELECTROLYTIC
±10%
470UF/16V
ELECTROLYTIC
±10%
47UF/16V
CERAMIC
±10%
47PF/lOOV
ELECTROLYTIC
±10%
4.7UF/50V
ELECTROLYTIC
±10%
4.7UF/50V
ELECTROLYTIC
±10%
4.7UF/50V
ELECTROLYTIC
±10%
47UF/16V
ELECTROLYTIC
±10%
47UF/16V
MYLAR
±10%
O.O022UF/lOOV
MYLAR
±10%
O.O082UF/lOOV
MYLAR
±5%
O.O082UF/lOOV
MYLAR
±5%
O.O022UF/lOOV
ELECTROLYTIC
±20%
4.7UF/50V
ELECTROLYTIC
±20%
4.7UF/50V
MYLAR
±5%
O.lUF/lOOV
MYLAR
±5%
O.lUF/lOOV
ELECTROLYTIC
±20%
47UF/16V
ELECTROLYTIC
±20%
47UF/16V
ELECTROLYTIC
±20%
4.7UF/50V
ELECTROLYTIC
±20%
4.7UF/50V
ELECTROLYTIC
±20%
47UF/16V
ELECTROLYTIC
±20%
47UF/16V
MYLAR
O.O022UF/lOOV
MYLAR
±5%
O.O082UF/lOOV
09CClOOK20PF
09CClOOK20PF
05CE16M470UF
05CE16M470UF
05CE16M47UF
09CClOOK47PF
05CE50M4.7UF
05CE50M4.7UF
05CE50M4.7UF
05CE16M47UF
05CE16M47UF
08CMlOOJ0.0022UF
08CMlOOJ0.0082UF
08CMlOOJ0.0082UF
08CMlOOJ0.0022UF
05CE50M4.7UF
05CE50M4.7UF
08CMlOOJO.lUF
08CMlOOJO.lUF
05CE16M47UF
05CE16M47UF
05CE50M4.7UF
05CE50M4.7UF
05CE16M47UF
05CE16M47UF
08CMlOOJ0.0022UF
08CMlOOJ0.0082UF
-9-
Table of contents
